davide added a comment.
If you take my example, and you pass `-target x86_64-pc-win32-macho`:
On clang-3.8, `TinkyWinky` is lowered to a GV with `weak_odr` linkage:
$ clang++ 1.cpp -o - -emit-llvm -S -fms-extensions -target
x86_64-pc-win32-macho
; ModuleID = '1.cpp'
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-macho"
@TinkyWinky = weak_odr global i32 0, align 4
!llvm.module.flags = !{!0}
!llvm.ident = !{!1}
!0 = !{i32 1, !"PIC Level", i32 2}
!1 = !{!"clang version 3.8.0 (tags/RELEASE_380/final)"}
On clang-5.0 (trunk, release+assert), the compiler just crashes :(
$ ../clang++ 1.cpp -o - -emit-llvm -S -fms-extensions -target
x86_64-pc-win32-macho
clang-5.0: ../tools/clang/lib/CodeGen/CodeGenModule.cpp:479: void
clang::CodeGen::CodeGenModule::Release(): Assertion `(LangOpts.ShortWChar ||
llvm::TargetLibraryInfoImpl::getTarget
WCharSize(Target.getTriple()) == Target.getWCharWidth() / 8) && "LLVM wchar_t
size out of sync"' failed.
#0 0x000000000206f67a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x206f67a)
#1 0x000000000206d46e llvm::sys::RunSignalHandlers()
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x206d46e)
#2 0x000000000206d5bc SignalHandler(int)
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x206d5bc)
#3 0x00007f72dc473c30 __restore_rt (/lib64/libpthread.so.0+0x10c30)
#4 0x00007f72dafdf765 __GI_raise (/lib64/libc.so.6+0x34765)
#5 0x00007f72dafe136a __GI_abort (/lib64/libc.so.6+0x3636a)
#6 0x00007f72dafd7f97 __assert_fail_base (/lib64/libc.so.6+0x2cf97)
#7 0x00007f72dafd8042 (/lib64/libc.so.6+0x2d042)
#8 0x00000000022cab88 clang::CodeGen::CodeGenModule::Release()
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x22cab88)
#9 0x00000000028fbc77 (anonymous
namespace)::CodeGeneratorImpl::HandleTranslationUnit(clang::ASTContext&)
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x28fbc77)
#10 0x00000000028fa965
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x28fa965)
#11 0x0000000002ccdf38 clang::ParseAST(clang::Sema&, bool, bool)
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x2ccdf38)
#12 0x00000000028f9bbc clang::CodeGenAction::ExecuteAction()
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x28f9bbc)
#13 0x00000000025bae0e clang::FrontendAction::Execute()
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x25bae0e)
#14 0x000000000258c746
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x258c746)
#15 0x000000000264ac7b
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/davide/work/llvm/build-release/bin/clang-5.0+0x264ac7b)
#16 0x0000000000aff078 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/home/davide/work/llvm/build-release/bin/clang-5.0+0xaff078)
#17 0x0000000000a92775 main
(/home/davide/work/llvm/build-release/bin/clang-5.0+0xa92775)
#18 0x00007f72dafcb731 __libc_start_main (/lib64/libc.so.6+0x20731)
#19 0x0000000000afb7e9 _start
(/home/davide/work/llvm/build-release/bin/clang-5.0+0xafb7e9)
Stack dump:
0. Program arguments: /home/davide/work/llvm/build-release/bin/clang-5.0
-cc1 -triple x86_64-pc-windows-macho -emit-llvm -disable-free -main-file-name
1.cpp -mrelocation-model
pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -fmath-errno
-masm-verbose -mconstructor-aliases -target-cpu x86-64 -dwarf-column-info
-debugger-tuning=gdb -coverage-notes-f
ile /home/davide/work/llvm/build-release/bin/decl/-.gcno -resource-dir
/home/davide/work/llvm/build-release/lib/clang/5.0.0 -internal-isystem
/home/davide/work/llvm/build-release/li
b/clang/5.0.0/include -fdeprecated-macro -fdebug-compilation-dir
/home/davide/work/llvm/build-release/bin/decl -ferror-limit 19 -fmessage-length
181 -fms-extensions -fms-compatibili
ty -fms-compatibility-version=18 -std=c++11 -fno-threadsafe-statics
-fdelayed-template-parsing -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-dia
gnostics -o - -x c++ 1.cpp
1. <eof> parser at end of file
2. Per-file LLVM IR generation
clang-5.0: error: unable to execute command: Aborted (core dumped)
clang-5.0: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 5.0.0 (trunk 304592) (llvm/trunk 304594)
Target: x86_64-pc-windows-macho
https://reviews.llvm.org/D33852
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